This could be because you’re simply idle and focused on something other than your breathing. It’s similar to when you’re doing something like watching a movie or playing video games and you forget to blink often, therefore you get dry irritated eyes. In this case you’re just listening to a person ramble on and forget to breathe in enough oxygen for your body to be satisfied. It’s not, because you’re not paying it attention. You yawn and the flow of fresh air to your lungs instantly makes your brain fulfilled.
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